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Anthracite/silicon monoxide/amorphous carbon negative electrode material and preparation method thereof

A technology of amorphous carbon and silicon monoxide, applied in the field of electrochemistry, can solve problems such as low specific capacity, and achieve the effects of low preparation cost, improved cycle stability, and simple operation of the preparation method

Active Publication Date: 2017-09-19
OCELL NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the present invention, anthracite is used as a carbon source for graphitization treatment, which is an ideal negative electrode material for lithium ion batteries, but its specific capacity is low

Method used

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  • Anthracite/silicon monoxide/amorphous carbon negative electrode material and preparation method thereof
  • Anthracite/silicon monoxide/amorphous carbon negative electrode material and preparation method thereof
  • Anthracite/silicon monoxide/amorphous carbon negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The anthracite coal with a carbon content greater than 97% is subjected to mechanical ball milling. By adjusting the ball milling parameters, the average particle size of the anthracite particles is controlled within 0.1 to 1 micron to obtain anthracite fine powder. The anthracite fine powder is mechanically crushed and chemically removed. After high-temperature treatment, cooling and sieving to obtain graphitized anthracite, ball mill graphitized anthracite and graphitized anthracite with 8% SiO (particle size: 0.6-1.1 μm) for 8 hours, then add graphitized anthracite and SiO The mass fraction of the composite material was 10% citric acid and then ball milled for 8 hours. The obtained material was put into a tube furnace under a nitrogen atmosphere and sintered at 900 °C for 4 hours. After cooling and sieving, an anthracite / silicon monoxide / amorphous carbon composite negative electrode material was obtained. The electrode preparation method, battery assembly and test con...

Embodiment 2

[0025] The anthracite coal with a carbon content greater than 97% is subjected to mechanical ball milling. By adjusting the ball milling parameters, the average particle size of the anthracite particles is controlled within 0.1 to 1 micron to obtain anthracite fine powder. The anthracite fine powder is mechanically crushed and chemically removed. After high-temperature treatment, cooling and sieving to obtain graphitized anthracite, ball mill the obtained graphitized anthracite with 8% SiO (particle size: 0.6-1.1 μm) with a mass fraction of graphitized anthracite for 8 hours, then add graphitized anthracite and The mass fraction of the SiO composite material is 20% citric acid and then ball milled for 8 hours. The obtained material is put into a tube furnace under a nitrogen atmosphere and sintered at 900 °C for 4 hours. After cooling and sieving, an anthracite / silicon monoxide / amorphous carbon composite negative electrode material will be obtained. . The electrode preparation...

Embodiment 3

[0027] The anthracite coal with a carbon content greater than 97% is subjected to mechanical ball milling. By adjusting the ball milling parameters, the average particle size of the anthracite particles is controlled within 0.1 to 1 micron to obtain anthracite fine powder. The anthracite fine powder is mechanically crushed and chemically removed. After high-temperature treatment, cooling and sieving to obtain graphitized anthracite, ball mill graphitized anthracite and graphitized anthracite with 8% SiO (particle size: 0.6-1.1 μm) for 8 hours, then add graphitized anthracite and SiO The mass fraction of the composite material was 30% citric acid and then ball milled for 8 hours. The obtained material was put into a tube furnace under a nitrogen atmosphere and sintered at 900 °C for 4 hours. After cooling and sieving, an anthracite / silicon monoxide / amorphous carbon composite negative electrode material was obtained. The electrode preparation method, battery assembly and test con...

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Abstract

The invention provides an anthracite / silicon monoxide / amorphous carbon negative electrode material and a preparation method thereof. The prepared composite negative electrode material is a powdered lithium ion battery negative electrode material which is prepared by performing mechanical ball grinding and dispersion on amorphous SiO, anthracite and citric acid and then sintering the materials and has the particle size of about 13 to 15 microns. The preparation method of the anthracite / silicon monoxide / amorphous carbon negative electrode material comprises the following steps: performing smashing, impurity removal and high temperature treatment on anthracite mine, mixing the treated anthracite mine with SiO, then adding the citric acid for coating, performing mechanical ball grinding and compounding, thus obtaining a precursor, and performing high temperature treatment, thus obtaining the lithium ion battery negative electrode material with high specific capacity. By effective combination of high conductivity of a carbon material and high lithium storage capacity of SiO, the composite material has excellent electrochemical property; under a condition of 0.1 A / g, after the anthracite / silicon monoxide / amorphous carbon negative electrode material is cycled for 100 turns, the reversible capacity is up to 459.2 mAh / g, and certain feasibility selection is provided for functionization of the SiO negative electrode material.

Description

technical field [0001] The invention relates to a lithium-ion battery anthracite / silicon monoxide / amorphous carbon composite negative electrode material and a preparation method thereof, belonging to the field of electrochemistry. Background technique [0002] Due to its excellent performance (such as high operating voltage, high specific energy, good cycle performance, long service life, wide operating temperature range, no memory effect, small self-discharge, no pollution, etc.) , wireless communication and transportation facilities and other major energy storage devices. At present, commercial lithium-ion batteries mainly use graphite-based carbon materials as negative electrode active materials. However, carbon-based negative electrode materials cannot meet the requirements of electronic devices due to their low specific capacity (372 mAh / g) and safety issues caused by lithium deposition. Miniaturization and automotive lithium-ion batteries require high power and high c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/364H01M4/48H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 杨学林宋凡张斐吴璇
Owner OCELL NEW ENERGY TECH
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